Shallow Linear Aeration Compressors & Kits Option:9730 50w Kit The royal blue colour is

The royal blue colour is excellent for showing koi colours

These airstones are housed in a plastic body to help protect the airstone and give a cleaner look

A variety of sizes are available and all are guaranteed to resist cracking

and a ⅜" Barb air outlet

Shallow Linear Aeration Compressors & Kits Option:9730 50w Kit The royal blue colour isThese air pumps are a powerful and reliable option for ponds, tanks and aquaponic beds up to 4 ft deep. **If air stones are more than 4' deep there will be undue wear on the diaphragms and will void the warranty. Aluminum covers and internal noise absorbing systems make these linear pumps surprisingly quiet and rugged. The pump housings are designed for use outdoors but are not waterproof so they need to be kept up out of puddles and with good